﻿<p>The purpose of this defined type is enabling the assignment of a set of <em>IfcPropertySetDefinition</em>'s to an <em>IfcRelDefinesByProperties</em> relationship.</p> 

<blockquote class="NOTE">
NOTE&nbsp; The sole purpose of this defined type is to enable an upward compatible enhancement
of the objectified relationship <em>IfcRelDefinesByProperties</em> in order to assign multiple <em>IfcPropertySet</em>'s, <em>IfcElementQuantity</em>'s or other subtypes of <em>IfcPropertySetDefinition</em>
to objects using a single instance of <em>IfcRelDefinesByProperties</em>.
</blockquote>

<blockquote class="history">HISTORY&nbsp; New type in IFC4.</blockquote>